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Old 04-09-2001, 02:22 AM
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Join Date: Mar 2001
Location: Memphis, TN
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I just put in a pair of weber carbs this weekend along with a new flexible rubber fuel line. However, I can't get the car started now, and have traced the problem down to no fuel coming in through the line. Pumping gas pedal several times didn't bring any fuel down the line. Can anyone help me figure out what I did wrong? I don't know if this matters, but the day before I changed the carbs, I accidentally left the key in the ignition in the run position and drained down the battery. Anyhelp would be greatly appreciated. Hemant

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Old 04-09-2001, 11:21 AM
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Location: Virginia Beach, VA
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Hemant … First, draining your battery will nave no effect on the fuel pump or the carburetors; it may, however, have a bearing on the engine not starting.

Check to see if your initial conclusion is correct. Verify that you are getting fuel to the carburetors by removing the new rubber hose, turn the engine over and see if fuel squirts out. If fuel squirts out, you are getting gas to the carburetors and you should then check the electrical side. Leaving the key on all night might have burned the points in the distributor. Check for spark by removing the distributor center wire and while holding the end close to the block as someone else turns the engine over. If you do not see a spark, you probably need to clean or replace the points. Try filing the points to clean them, regap them and see if you now have a spark.

Good Luck
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190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"
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Old 04-09-2001, 03:47 PM
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Okay, I have a theory about why its not working... The fuel pump is mechanical...driven by the engine (right?). If so, with air in the fuel line the engine cannot start and therefore it can't pump the fuel up the fuelline into the carbs. This seems logical, but in this case, how do you get fuel into the carbs? Seems like a catch 22. Does anyone know if it is a mechanical fuel pump in the 1957 190SL?
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Old 04-11-2001, 05:03 PM
EricH
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You can easily check your pump by disconnecting the coil and fuel hose after the pump and preferably where you can put the end of the fuel line into a jar to collect the fuel and crank the engine. If you don't get fuel after about 20 secs of cranking you have a problem. Things to check are the fuel filter for blockage and also the reserve valve.

My 190sl had a rusty tank and rust plogged the fuel filter before the pump completely. This seemed to happen after running it low on gas. Eventually I had the tank removed, boiled and painted so it wouldn't happen again.

A fuel pump is easy to put in, but they are not cheap.

Eric

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